diff --git a/gatewayBackend.php b/gatewayBackend.php
deleted file mode 100644
index e1b1a8b..0000000
--- a/gatewayBackend.php
+++ /dev/null
@@ -1,51 +0,0 @@
-<?php
-interface gatewayBackend
-{
-	/**
-	 *
-	 * @param String $username
-	 * @param String $password
-	 * @param String $ip
-	 * @param String $sessionId
-	 * @return String $token
-	 */
-	public function getToken($username, $password, $ip, $sessionId);
-        
-        /**
-         * 
-         * @param String $token
-         * @param String $sessionId
-         * @param String $ip
-         * @return Boolean
-         */
-        public function checkToken($token, $sessionId, $ip);
-        
-        /**
-         * removeToken() Remove a logged out user's token
-         * 
-         * @param String $ip
-         * @param String $sessionId
-         * @param String $token
-         */
-        public function removeToken($ip, $sessionId, $token);
-
-        /**
-         * auditLog() Log audit messages
-         * 
-         * @param String $ip
-         * @param String $event
-         * @param String $message
-         */
-        public function auditLog($ip, $event, $message);
-        
-        /**
-         * messageLog() Log sent messages
-         * 
-         * @param Integer $senderId
-         * @param String  $recipient
-         * @param String  $message
-         * @param String  $ip
-         */
-        public function messageLog($senderId, $recipient, $message, $ip);
-}
-
diff --git a/src/SmsGateway/AuthInterface b/src/SmsGateway/AuthInterface
deleted file mode 100644
index c864c36..0000000
--- a/src/SmsGateway/AuthInterface
+++ /dev/null
@@ -1,6 +0,0 @@
-<?php
-namespace SmsGateway;
-
-interface AuthInterface
-{
-}
diff --git a/src/SmsGateway/AuthInterface.php b/src/SmsGateway/AuthInterface.php
new file mode 100644
index 0000000..44e860c
--- /dev/null
+++ b/src/SmsGateway/AuthInterface.php
@@ -0,0 +1,17 @@
+<?php
+namespace SmsGateway;
+
+use SmsGateway\LoggerInterface;
+
+interface AuthInterface
+{
+    public function setLogger(LoggerInterface $logger);
+
+    public function getLogger();
+
+    public function getToken($username, $ip, $sessionId);
+
+    public function isTokenValid($token, $ip, $sessionId);
+
+    public function removeToken($token, $ip, $sessionId);
+}